Spectroscopic study on the precipitation of sodium alkyl sulfate with cetylpyridinium chloride

Song, Hwan Young; Oh, Sun Wha; Moon, Sung Doo; Kang, Young Soo

doi:10.1016/j.jcis.2007.05.075

Cited by 6 publications

(9 citation statements)

References 14 publications

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“…A similar effect on the precipitate structure has been previously reported and appears to be governed by the molar ratios of anionic and cationic surfactants in the mixture. 38 …”

Section: Resultsmentioning

confidence: 99%

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Solution Structures of Anionic–Amphoteric Surfactant Mixtures near the Two-Phase Region at Fixed pH

et al. 2022

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We examine the solution structures in a mixed surfactant system of sodium dodecyl sulfate (SDS) and N , N -dimethyldodecylamine N -oxide (DDAO) in water, on both sides of the two-phase boundary, employing dynamic light scattering, small-angle neutron scattering, and Fourier transform infrared spectroscopy. The precipitate phase boundary was accessed by lowering pH to 8, from its floating pH 9.5 value, and was experimentally approached from the monomeric and micellar regions in three ways: at fixed DDAO or SDS concentrations and at a fixed (70:30) SDS:DDAO molar ratio. We characterize the size, shape, and interactions of micelles, which elongate approaching the boundary, leading to the formation of disk-like aggregates within the biphasic region, coexisting with micelles and monomers. Our data, from both monomeric and micellar solutions, indicate that the two phase structures formed are largely pathway-independent, with dimensions influenced by both pH and mixed surfactant composition. Precipitation occurs at intermediate stoichiometries with a similar SDS:DDAO ratio, whereas asymmetric stoichiometries form a re-entrant transition, returning to the mixed micelle phase. Overall, our findings demonstrate the effect of stoichiometry and solution pH on the synergistic interaction of mixed surfactants and their impact on phase equilibrium and associated micellar and two-phase structures.

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“…A similar effect on the precipitate structure has been previously reported and appears to be governed by the molar ratios of anionic and cationic surfactants in the mixture. 38 …”

Section: Resultsmentioning

confidence: 99%

“…Variation in the size and shape of precipitated structures has also been seen before for another anionic–cationic surfactant mixture, SDS and cetylpyridinium chloride (CPCL), as the molar ratio of SDS to CPCl was increased. 38 …”

Section: Resultsmentioning

confidence: 99%

Solution Structures of Anionic–Amphoteric Surfactant Mixtures near the Two-Phase Region at Fixed pH

et al. 2022

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“…This was proved by UV-measurements. The characteristic absorption of CPCl at ~260 nm [59,60,61] was detected in the solution of CSA, and it was absent in the equilibrium supernatant of CSA@MNP samples even at high CSA concentration. The presence of cetylpyridinium chloride is not favorable for preparing stable CSA@MNP samples, but this problem can be solved by production under accurate conditions (specific pH, ionic strength, and ultrasonication).…”

Section: Resultsmentioning

confidence: 99%

Chondroitin-Sulfate-A-Coated Magnetite Nanoparticles: Synthesis, Characterization and Testing to Predict Their Colloidal Behavior in Biological Milieu

Tóth

Illés

Szekeres

et al. 2019

IJMS

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Biopolymer coated magnetite nanoparticles (MNPs) are suitable to fabricate biocompatible magnetic fluid (MF). Their comprehensive characterization, however, is a necessary step to assess whether bioapplications are feasible before expensive in vitro and in vivo tests. The MNPs were prepared by co-precipitation, and after careful purification, they were coated by chondroitin-sulfate-A (CSA). CSA exhibits high affinity adsorption to MNPs (H-type isotherm). We could only make stable MF of CSA coated MNPs (CSA@MNPs) under accurate conditions. The CSA@MNP was characterized by TEM (size ~10 nm) and VSM (saturation magnetization ~57 emu/g). Inner-sphere metal–carboxylate complex formation between CSA and MNP was proved by FTIR-ATR and XPS. Electrophoresis and DLS measurements show that the CSA@MNPs at CSA-loading > 0.2 mmol/g were stable at pH > 4. The salt tolerance of the product improved up to ~0.5 M NaCl at pH~6.3. Under favorable redox conditions, no iron leaching from the magnetic core was detected by ICP measurements. Thus, the characterization predicts both chemical and colloidal stability of CSA@MNPs in biological milieu regarding its pH and salt concentration. MTT assays showed no significant impact of CSA@MNP on the proliferation of A431 cells. According to these facts, the CSA@MNPs have a great potential in biocompatible MF preparation for medical applications.

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“…Aer achieving their solubility product, the SDS-CpCl solution forms vesicular aggregates or simply precipitates out. 44 But here, these salts were taken at a concentration which is much less than their solubility product. So there isn't any formation of such vesicular aggregates.…”

Section: Absorption and Steady State Emissionmentioning

confidence: 99%

Micellar charge induced emissive response of a bio-active 3-pyrazolyl-2-pyrazoline derivative: a spectroscopic and quantum chemical analysis

et al. 2014

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The medium charge specific excited state behaviour of a bio-active and fluorescent 3-pyrazolyl-2pyrazoline derivative (PYZ) was systematically monitored in aqueous solutions of ionic (CTAB, SDS) and non-ionic (Triton X-100) micelles, applying steady state and time resolved fluorescence spectroscopy in addition to theoretical molecular simulations. PYZ displays complementary emission characteristics according to the nature of the effective charge of the micelles which was rationalized on the very fundamental basis of the frontier molecular orbital approach as obtained from quantum chemical calculations involving Time Dependent Density Functional Theory (TD-DFT) in combination with B3LYP exchange correlation function using 6-31G(d,p) as the basis set. Dynamic Light Scattering (DLS) measurements provided crucial information regarding the fluorescence quenching pattern of micelle bound PYZ by quencher CpCl. This study essentially accentuates PYZ's photophysical response in different micellar media in conjunction with their individual mode of electrostatic interaction therein. The theoretically calculated HOMO-LUMO energy gap values provide adequate information about the emissive behaviour of PYZ in ionic micellar media. The variation in the lifetime values of PYZ in aqueous and micellar media act as added evidence of the fact that PYZ basically resides in different microenvironments as introduced by the respective micelles. Conclusively it was observed that, in the excited state, PYZ responded promptly and uniquely according to the nature of the micellar charge. † Electronic supplementary information (ESI) available: Normalized absorption spectrum of PYZ in different micellar environments; MO diagrams of PYZ in different micellar media along with their corresponding energy values. See Scheme 1 5-((4 0 S,5 0 R)-1 0 -(4-Bromophenyl)-4 0 ,5 0 -dihydro-4 0 ,5 0 -diphenyl)-1H-pyrazol-3-yl)-3-methyl-1-phenyl-1H-pyrazole-4-carbonitrile [PYZ]. 56362 | RSC Adv., 2014, 4, 56361-56372 This journal is

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Spectroscopic study on the precipitation of sodium alkyl sulfate with cetylpyridinium chloride

Cited by 6 publications

References 14 publications

Solution Structures of Anionic–Amphoteric Surfactant Mixtures near the Two-Phase Region at Fixed pH

Solution Structures of Anionic–Amphoteric Surfactant Mixtures near the Two-Phase Region at Fixed pH

Chondroitin-Sulfate-A-Coated Magnetite Nanoparticles: Synthesis, Characterization and Testing to Predict Their Colloidal Behavior in Biological Milieu

Micellar charge induced emissive response of a bio-active 3-pyrazolyl-2-pyrazoline derivative: a spectroscopic and quantum chemical analysis

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